package ooday09;

public class Test {
    public static void main(String[] args) {
        // 每个对象都是多态的 一种自己 一种 Object
        Aoo a = new Aoo();
        Object a1 = new Aoo();

        Boo b = new Boo();
        Object b1 = new Boo();
    }
}
class Aoo{

}
class Boo extends Aoo{

}
